Statistics Class 9 Notes Maths - Chapter 14
What Are Statistics ?
Statistics is a branch of study that deals with the collection, presentation, analysis and interpretation of data.
Facts or figures, collected with a definite purpose.
Graphical Representation Of Data
Bar Graphs, Histograms of uniform & varying widths and frequency polygons.
The data obtained in original form.
The data given in the form of class interval such as 0–20, 20 – 40, and so on.
Upper limit - Lower limit
The number of times an observation or group observations occur.
Upper limit of the one class is lower limit of the next class.
Upper limit of the class is not same as lower limit of the next class.
(Lower limit+Upper limit/2)